Preheat the oven to 350°F (175°C) and grease a 9x5-inch loaf pan.
In a large bowl, mix together the beaten eggs, milk, bread crumbs, onion, salt, black pepper, and sage until well combined. Gently incorporate the ground beef, ensuring an even mixture; then press it into the prepared loaf pan.
Bake for about 50 minutes or until the meatloaf is cooked through (internal temperature of at least 160°F [70°C] with an instant-read thermometer).
While the meatloaf bakes, prepare the glaze by mixing the ketchup, brown sugar, and dry mustard powder in a bowl until the sugar dissolves.
Once the meatloaf is cooked, spread the glaze on top and return it to the oven. Bake until the glaze sets, approximately 10 more minutes.
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